No scanners were identified. If you were expecting something different,check that the scanner is plugged in, turned on and detected by thesane-find-scanner tool (if appropriate). Please read the documentationwhich came with this software (README, FAQ, manpages).[coolscan3] sane_coolscan3_exit

I have no idea what this could mean. Any hints for me? Anything I can doto find out why I fail to use the scanner?